Combined cabbtjreter and vacuum-feed device



W. JAY.

COMBINED CARBURETER AND VACUUM FEED DEVICE.

APPLICATION FILED APR.29. IQIB.

1,31 1,1 67. v A Patented JuIy 29, 1919 2 sHEETs-sHEET Il JAY.

COMBINED CAKRBURETER AND VACUUM FEED DEVICE.

APPLICATION FILED APR.29. 191B.

Patented July 22), 1919.

SHEET 2.

2 SHEETS-- WlilBB JAY, F CHICAGO, ILLINOIS.

- COMBINED CARBURETER AND VACUUM-FEED DEVICE.

To all whom t may concern.'

\ Be it known that I, WEBB JAY, a citizen of the United States, residing at Chicago,

u in the county `of Cook and the State of Illinois, have invented certain new and useful Improvements in Combined Carbureter and Vacuum-Feed Devices, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to pro- A vide an improved device of the nature of a combined carbwreter and vacuum fuel feed device, having the functions of the carbureter and the vacuum fuel feed de vice in a single compact structure. It consists in the features of construction shown and described, as indicated in the claims.

In the drawings:

Figure 1 is a vertical 1-1, on Fig. 2, of a structure embodying this invention in one of its forms.

Fig. 2 is a section at the line, 2 2, on Fig. 1.'

Fig, 3 is a partly sectional side elevationV of a modified form of the invention showing the upper portion of the vacuum fuel feed tank, section -beingmade axially with respect to the venturi of the carbureter.

Fig, 4 is a section at the line, 4 4, on Fig.-3. l 1

In the structure shown in Figs. 1 and 2,

av customary form of vacuum fuel feed tank is shown, comprising the vacuum chamber, 1, depending within the reserve chamber or reservoir, 2, boththesevparts being broken away intermediate their ends for condensing the view, the vacuum chamber containing the usual devices for alternating the dominance of suction and atmospheric pressure, consisting of the suction-control ling valve, 4, air inlet valve, 5, operating float, 6, and ylever connections from the float to the valves. The cap plate, 8, of the lvacuum fuelfeed device to which the chambers, 1 and 2,l are attached in the customary manner has mounted upon it,and preferably formed vintegral with it, as shown, the Venturi tube, l0, of the carbureter, positioned with its axis substantially horizontal and adapted by means of a flange, 10, to be secured .to thc intake manifold of the engine to be served, as seen in Fig. 2, this I :securement serving to 4support the entire v and vrvacuum fuel feed device. The liquid device comprising the combined carbureter Specicaton of Letters Patent.V

section at` the line,`

Patented July 29, 1919.

vApplication filed April 29, 1918. Serial No. 231,315.

140, and connection for suction is made into 'u this bore, 14", from the Venturi tube, opening .into the latter at a point beyond the throat or constricted portion thereof, that is between said constricted point and the intake manifold, as seen at 14d. The usual connection for admitting atmospheric pressure to the reservoir or reserve chamber, 2, is made by an aperture, 16,/ leading from the annular interspace between the vacuum chamber and said reserve chamber at the upper end thereof, intersecting a transverse bore, 16a, which leads into the bore, 16, and is closed at :its outer end b a plug1 16". The customary goose-neck, 1l, is connected to the upper end of the bore, 14a, for the usual purpose.

The carbureter shown in this construction is of the form which in itself is not a part of the present invention. A valve, 20, is pivoted for swinging in the Venturi tube, at a position a little beyond the throat or most constricted point thereof, fuel supply being admitted thro-ugh the spindle, 21,

upon whichl the valve is pivoted, said spin-- Vto the spindle, 2l, and leading to a notch,

20c, at the periphery of the valve for admitting air for admixture with the liquid fuel as the latter is sucked in through the central aperture, 20, of the valve. A boss, 23, upon the upper side of the cap plate, 10, extending transversely to the boss in which the Venturi tube is formed` and intersecting the latter boss substantially at the apex or constricted point of the Venturi tube, is bored' from one end as seen at 24a, to receive the operating stem, 24, of the valve, 20, said stem having at its outer end an operating lever arm, 25, by which the valve (not shown), is made by a vertical.

is adjusted by yany convenient means not shown. From the other end of the boss it is axially Ibored at 22 to admit the spindle, 21, above mentioned, whichhas its enlarged .-head exteriorly threaded for screwing it i end of the bore, 22, is closed by screw plug,

26. The fuel supply duct. by which the liquid fuel'is conducted from the reservoir or reserve chamber 2, of the vacuum fuel `feed tank to the carbureter is connected with the bore, 22, by means of a vertical bore, 27,:extending from the under side of the cap up into the boss, 23, and opening into the bore, 22, thereof, as seen in Figs. 1

Aand 2, and the pipe, 28 leading from the lower part of the reservoir or reserve chamber, 2, extends through the annular intei-i space between the vacuum chamber 1, and the reserve chamber 2, to reach and be inserted into and made tight at this bore, 27.

For the purpose of trapping a limited quantity of liquid fuel in the pipe, 28, and holding `such quantity ata posltion quite near to the point of discharge in the carbureter throat, lthe pipe, 28, is formed with. a drooped portion or loop situated at the upper part of the annular space mentioned;

and. to give loop or droop considerable ca.- pacity,v the pipe, 28, is coiled around the vacuum chamber 1, in saidannular inter- Vspace, and the loop or drooped portion is made to comprise the entire coil seen at 281. In order that the fuel may be trappedl in and not siphoned out of this droo a small aperture, 28, is made at the hig est point of what would constitute a Siphon, not suflic 1ent to prevent the liquid fuel from being l1fted through the tube by the suction discharge point in the Venturi tube, but suclent, nevertheless to break the siphonA of which said loop wouldbe the shorter limb and the final depending portion of the pipe would be the longer limb if its siphoning character were not-prevented by the admis- I sion of the atmosphere leak through this w In the port, 28C.

l forms shown inFigs. 3 and 4, the,y carbureter Venturi tube is formed inte ally with the cap plate of the vacum'tan but 4instead of the Venturi t`ube being horizontal f and upon the top of the cap, it is vertical and appended laterally to the cap. In this posltion the Venturi tube is braced rigidly with respect to thecap by a rib, 10, which" is formed with the suction-connected duct,

fuel feed device comprising a mixing chamin Figs. 1 and 2, leading into the port, 22",

(corresponding to the bore, 22, of the otherv igures,) which is formed in the transversely-extending boss or rib, 23X, which corresponds to the boss, 23, of the other figures', and has `atthe opposite side of the Venturi tube the bore, 24"-, forming the seat for the valve-operating stem havlng the operating lever arm,`25, as in the other figures.

I .claim 75 1. Infa combined carbureter and vacuum l fuel feed device, the latter comprising a vacuum chamber and a fuel reserve chamber into which rthe vacuum'chamber discharges Iupon relief of the vacuum in the latter, and means for alternately producing and relieving the partial vacuum in the vacuum chamber, the fuel reservechamber having means for admittin pressure of the atmosphere upon the surface of the liquid therein, said g5A reserve chamber being as to its entire li uidcontaining cavity, situated at a lower evel than the mixin chamber of the carbureteig, and a duct lea ing from thelower part of said reserve chamber terminating 'in the mixing` chamber for discharge of the liquid fuel in the latter by the suction of the englne. v v2. In the construction defined in claim 1 foregoing, a top or cap member which is common to the vacuum chamber and .the liquidffu'el reserve chamber, the carbureter mixing chamber being formed integrally with said top cap member.

3. Inthe construction defined .in claim 1 100 to the vacuum chamber and the liquid fuel reserve chamber, and which is adapted to carry both said chambers, the carbureter mixing chamber being formed integrally with said top or cap member, and, adapted odattachment to the engine intake mani- 4.. A icombinedy carbureter', and vacuum ber and a vacuum fuel feed structure which embodies the vacuum 'chamber and a liquid fuel reserve chamber into ywhich the vacuum chamber discharges the liquid uponrey lief of the. vacuumn the Avacuum chamber; "y

means for producing and relieving -the partial vacuum'in the vacuum chamber; 'said fuel reserve chamber having means for admitting the pressure of the atmosphere to the surface .of the liquid therein; "a'top or 120 cap member which is common to4 the vacuum chamber anld to the fuel reserve chamber, the mixin chamber of the carbureter being .formed integrally withsaid top cap member, and a yfuel feed duct from the reserve chamberleading from the lower part thereof, upward within said chamber into said top or capmember, 'and thence insaid top or cap memberto the mixing chamber.'

5. A combinedY carbureter and` vacuum 13a i vacuum chamber and the liquid fuelreserve fuel feed device comprising a carbureter mixing chamber, and arvacuum fuel feed device which consists of a vacuum chamber and a reserve liquid fuel chamber into which the vvacuum chamber discharges upon relief of partial vacuum in the vacuum chamber, the

chamber having a separable cap or top member which is common to the two chambers, the vacuum chamber being positioned within the reserve chamber with an interspace WEBB JAY. 

